You ____ wash your hands before meals.It's good for your health. A.have to B.must 答案是B 为什么?

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You ____ wash your hands before meals.It's good for your health. A.have to B.must 答案是B 为什么?
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You ____ wash your hands before meals.It's good for your health. A.have to B.must 答案是B 为什么?
You ____ wash your hands before meals.It's good for your health. A.have to B.must 答案是B 为什么?

You ____ wash your hands before meals.It's good for your health. A.have to B.must 答案是B 为什么?
答案是B,因为两者都表示必须的概念
然而A是指客观,即外界因素所促使你
B是指主观,即通过自己的想法所促使你.
依题意吃饭前洗手是好习惯,应发自主观,所以应选B

You __B__ wash your hands before meals.It's good for your health.
A.have to B.must
他们两个的区别是前者指的是义务，客观的必须我必须回家了（外面下雨了）
后者指的是自己意愿的必须----我现在必须回家了（我想写作业）
哪里不懂欢迎追问

朋友，这里的答案之所以选B.must，
是因为：
have to表示：不得不，必须，主要是客观原因导致的不得不；
must表示：必须，主要是主观原因，人为确定的，
这里洗手肯定是人为确定的，不是客观原因不得不这么做。
明白了吗？朋友？

因为一个句子中有且只有一个谓语动词，现在句子中wash是谓语动词，不需要have这个动词了，况且在这里have也翻译不过去啊，must为情态动词，翻译为必须。合乎句意。
整句话意思是：你吃饭之前一定要洗手，这样对你的健康有好处。

must 情态动词must是必须，但不是无奈去做的，have to 是没有别的选择，带有无奈的意味

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